Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e0b9ffc23aaecf4c794e2599dd81094e54bfe5ae360a39fa11ba69f4f4eb0c' 
  AND token = 'SeDJcPFdDbTLVAvMcg1vZUwwkj45eG9eoJEpVjH8ZG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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