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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c425c3c938ce58196c32b22bffc9f4277b8dc40e802f6aa13c98013030b51fa2' 
  AND token = 'bjfmY++xjaLbDWssiNDnK1pLsWHKv3IE5Ax5GQ58HtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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