Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2adfed5ba95a2d8adf1b3d6a6d5cba681bde0f8a5945c69cd47efa45eec4e49b' 
  AND token = 'ItzU5uh/xeNA2LMNdCsGFIC4Ih2iKo6sgfa0I2G2RM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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