Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9cff73cebae589ce480e3d6f6315942e8e364333ed3a4e28cc122c6e2674339' 
  AND token = '2YxaNMGBG1dzStNKIM8249e5BPP5/lKyjtw04mO+5hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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