Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec4f4341c6faa0529331420aa4b405f5b362277fab3f5c1c2041f94af1c65640' 
  AND token = 'AlMLmxJy/k65c4m7viqcrG5Y8DyrBvpoiaVgNUABlK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}