Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8340a887cfd91cac51b79995828c2a6f4770e4174df3d380d1d1f5ba371f33d' 
  AND token = 'KTJp/exAQKMlyZDQJuY4dIJmmHtE5Z3jjTXROCm9UaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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