Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5875e046380620c7134dfaefecf2ad7470a7498eae5e838c75f3f1717e2edcc' 
  AND token = 'g7lydm25MW8ka3HcnGcVC2cFeD20TdHFraxTGvOSpm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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