Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b06566716c263d497a38316a0138b352048be950f9a476e2f26c1a1cd8f3789' 
  AND token = '0L14nMDT1UbQqxhK/FBbJwDU51Ap7miDB5BpBrN96+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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