Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c5dfe8e79ba3c07d0daf861d3c53f08088c5ce829bbf050d66932ff2f46309e' 
  AND token = 'uMfca45v2eDriBiDbrwdrVStwAGYlZEhLl8iDKq05CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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