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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ce5c5faf50afa074200a37594de30fa57c9148a06e0887a75fe8c09b9ef61166' 
  AND token = 'vGS9YOk3dC3TFeU+ccB+mz2H/fIUqCIZF7cIj1OsAtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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