Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa9c8ae5e6fd905fdc5f8451b3c48d5da94c212951d6444f7a8fb15bd66d74b6' 
  AND token = 'Hbt4vY3cy56YDNguoF+q5cKSTxa5mz9P8IJ+Yp0R2jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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