Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b3c9f8844212df0c4388ad33c14a30a05a069529f50f990658fda0f8cdeb2d' 
  AND token = 'IIkhVGfR0lPGVtBm45uVoGYCQ0kKA+FBQCnEGbplQW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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