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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '884d72a1d31d096e652f454faac79868fcb82494a8d2e4824288bb47fc335049' 
  AND token = '/ot8f3mQpwUZOtfXMXzPjyAdl2xD8t8BBbHJDD5ni9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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