Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8455ee5518a6f97a4e500269382a7a5aee8186b2bb37545acb86e28ee54bea06' 
  AND token = 'SxWnC1+9NEBXpSPGwwHIrwmqET9W5KupWjaC2qh+JQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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