Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa2b2bc61cd703be2b9b1dcdb94d80031ade3581432e9c3bc408c41ebbb91c3' 
  AND token = 'v6pgtE/v/xBY0yGT6I+hXLX1nMLG/cVclYrShBWUNxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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