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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0ff26110b5902577b324fdf80aa7a8ae570719a71dddb5a8a3d02d5b20180acc' 
  AND token = 'wnCAflgHrY90AJJZEwAY4HV5Y8s2yTF4Fbrne3AXDGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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