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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3a388b114ebe5fe4725aec6fade3f5fc9723bed4a9d15c43b8e9c0a4c06cffb3' 
  AND token = 'WWdOdqPlOXYgG938dX8MieF/TEDC2HbA1oLOmi+n7X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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