Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6934943e31decdeb0f6c10e8d4d168b7040851b83118fd7bf6b8ee2f6e880246' 
  AND token = 'mtZZ6o+6YqF+a9yfOpGMOqxKZWoFmzqFJ5MRTTDsXU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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