SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f1fb6190bbc9c7f9cf3e51434432616a1526625d37883fa39bf2d4f10814b26c' 
  AND token = 'm4e0aV/aq/vm+KmDNI5qRKPD/i9bw5aHdxYoZYWYknc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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