Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53a57c83dc3693c83daf2512775c9836ba093d4fe96e47a14eb7e115519a45d0' 
  AND token = 'PXPCsDenAimZsaRPEunF6avmGlvJRpxX3LLp4lqngJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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