Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9307fdbec1a8f923d7969182a141d763a835e6b6f809a3a0db26b6e2aa3913aa' 
  AND token = 'tiCrM0ZN1OBOAsmjLpr27FoA4x6vzBmDcVUYmlrQoqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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