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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2efa3646a444f06706276b56c553f5d22477ee0abefa3d531a3e4093aede947b' 
  AND token = 'gpO6D6kg/NVaeoNXGZjKeJI/0BEgx48dHMv71gEt0N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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