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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'acb154ee2d8c0e250879920628bd1abb3747d13a665bb6692f56c397c809ee9a' 
  AND token = 'LRUz2cKCgeEmaSmdmgr4iHOrlqWxtWhhKYY+uWTjNqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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