Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33bfd93df76c608cb1e788c1f31f5555da14517d4fff52d7aca82554b4a2c42' 
  AND token = 'rk8m+RCpgXOCAKLRP3fTp9ZbQC/PiMdiHVu/X/t+6m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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