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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'aab1a6b90b7ed68246e1bacef94f55ca81cf67e0a5a0b91e7218e2c304b237a3' 
  AND token = 'ywMm9adL0NrlnpIycj0g3kfoTwbF3DO84A/klE0dQFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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