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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd69e613d1485d56095464939741b394cb203114cb278ac21e9c67dcb8d962cf4' 
  AND token = 'wrVghp48Ysn4QLAzRgRCRE01YALdSEia87RrXWTNafE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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