Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70868b09f87ce656a7abdafd7f73fddad4b4f48f14c3a73da1f5c4ef0e2ede36' 
  AND token = 'MDaMnJZ8LChpD2+Hm42/ak3yv6UmX9Mag4UctlF99fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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