Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b64282b4205b93afa6e8032c0199ff4b9ecfbf08ac02fac09ae96f5c18fbf21' 
  AND token = 'ccBaFw41WTs0E5e/PLoh1j/dgKKwTqD4ZN0dXmC0gAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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