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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '061deca6f304a3353b61bca1b8f9574a2fa2396a9ef6224b395d018c8e70a184' 
  AND token = 'nY80mhckqawHM05cpy05GA8udmYv7DhNQLSb+n3siKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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