SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4a39a19436acff4f6c9143b33eaa894fafdb308736c116d78b128d4f704346d1' 
  AND token = 'xx4CNnZG6OgTv2wPTT3yJwWC2j5Q9BtvMAvEezl9EYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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