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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c11f86a223342f16006eb50de8cf95bab7f7c72b7f5d0c5051fd03a43bd00788' 
  AND token = 'Ysy01NzRTV3IAqLnc1f0So94KK9vmMA0KucCR3ZmHqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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