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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5d1c82bfc2ead5708665a5a8254aa87a825873a99e0b95f5bb680a6df32ae54e' 
  AND token = 'MwpDu0nKMu1ckV3RAaoMC42eD6I/wxnS5BylTeasQ5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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