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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ff1536a17a18355061785dfb7163808ac21cb6332395e89136b47e8e7311f974' 
  AND token = 'WbFhO22wHPyFcuXRGfgxZIW6UFoTZ/ZZWsIdn6WxcUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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