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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5eefbf1460e2a5919508c8b55f41d37402d3b486ebc6d701d04ea1ea406512c0' 
  AND token = 'qPuPj36pxn4RhsjXxmQ60OaWusWoRu8FLupNRxqZcUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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