Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8b1fa37a2c81aae1921e7aef819bcb9e7c9715e0556ed959a86eb1fae035362' 
  AND token = 'clzjxWE6LDTdKrRw7HBE+3bj1+O/xVnJwv04u3fmEN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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