Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6ef3ea2e34bc8e886ac9666e1d697f9b6916f9d3ad2f6a03d4f954ff7970ea4' 
  AND token = 'hIL9pdPwKSmGGKuhCR+ZrdbMxDi4kLkBmQy0YSGkdrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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