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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1480ef274b2ba58404f2138130ac9e079f9f74b1d84ff6d048a682b76a9b03ba' 
  AND token = '2ndg9IfmP4/XaWgYVvhJM8UeqD9txCWmk1Ttx1yWElc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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