Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd898a91bdca23db9fbb6a9b97f834c654698568020834cb40902e7f253f25c' 
  AND token = 'JBJTPkx/dgkkXECMk5JTiMmq14fsRuK8IS+KAmocJKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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