Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a75f28679ba822aa542b3fbe4a85a36bf9631a2913534ebcd05ba1aadc009c1' 
  AND token = 'dGPua5d7sJ0utUkHKaP+BMKy1omV3pQfcqbTImB39PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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