Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27d1ed72c3ca3517c7cae9c73757d2381713e47840f63b55fac6ba876abc36ad' 
  AND token = 'uHJ+0PPeufP5AAdfoJnpW8o4fL3WrJkAfBQVPsXbqzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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