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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '535a18c00883c6fc23eda79202874331eef4092d249f5e0b09f77990951477b4' 
  AND token = 'Z7qRYlJoo9Pss9exVBi/YrIArQk0rNfVUshaD93iCxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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