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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '86de6dd7da3ee9854e1815b4480745ea7a014964dde414c69c2f8aa15af4c838' 
  AND token = 'inDv1AHsdiNIzLNSEjTWAYxze9EO/8uTGvsgjQOay8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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