Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f84479bb9706012dc1216661efcc3d89a917ff7053e4acf1dc9edcb6142f6892' 
  AND token = 'SvlyUKPtpyBlOVYzm63sUnPc7iVzK7fiAoMgSuOkeNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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