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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f567109c5dd1575edfdfca9dc7a822bf1353ff3054e8addc79e0702cae4794a0' 
  AND token = 'hy008mz06bL919CgB3bCM3X4cbOPVcPQ0lcmv/3IkcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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