Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78953964f0c0504e90a6a27334d1de4e421e3044a570efb6662603f5691c5341' 
  AND token = 'jMds8AQD032eARIEAueoe60M+5xbXMLgNF/L9CEcuyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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