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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7ca57177791c1f923e6c283acc1036946835df6460339e5b246511444288b798' 
  AND token = '8gmDdU20PXwk/0W2M2+Qc8lkH5TLWDJSM/cMA7rmFss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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