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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '574c8ec211d2648404999dd43d302d968128a208aa7a45b1854bd472d6045688' 
  AND token = '+FK0UgVIMvpJUHrhHm2CVARbs54ESSZccybKnaI8HTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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