Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3734640b87581e23ee47abe6c7e35b9bc6f145fc2b08b1df7edf31055774279' 
  AND token = 'em6LW/6TWMIV25lmWKb4oC4AVqbF+DNSuZIx8YwaWGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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