Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba884a33446e592cd3aa49447abee6219dfcc1b3cf52e02ec2842dcae5c7908' 
  AND token = 'nBIitSTFCV1pwzIMvikpb+ZoNQElGwOrlgiMXfdwToQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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