Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72686dabca65e231f5d61ab5d14018960f04524b479dde8f250f29687180edd8' 
  AND token = '0A3TH2fMpFeIRsGbPQdJRghLJnw6GWFe1xHrx+l9YaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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