Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57503f066666aa48126a82a4f2f5c51b411e6942f2570c681e202a3485c5df50' 
  AND token = 'iNG+OSvzQ/J1FaNCR6TwucariPBu3NYEVeIGgzN7ktM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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