Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cb5a957663b01db064f7ad5b5551a2e898e644f646fc418c3121453bd4051cb' 
  AND token = 'OcvFR81eW0hRPH3oWyPOedFTrqYAgwa9QqJpVZYWr00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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