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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e84df0dcd60b418612dde572fc0cf2cfd490899a79af173444810056e95e1311' 
  AND token = '9agJ4QpT46/INd7wKSedxOANfORsPl8PqD+vwqO2vzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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