Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f12ca5f78bc74d0f93d40231a7c4e20f2518b96482b2e8b6d9b5ce5cffbcd610' 
  AND token = 'B/ALkjfR5iu5Qw902ixJZyKS/MPLlgMBVB+5e0Xc1H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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