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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ea32eaf855db4186f98b6a1d945badf38cd3ce3c2fe949f902f366e72eaf46f8' 
  AND token = 'sz2xcxcgfO59BmZI1PZ9hCBYQ8ujnnUBAsRk3OTG7as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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