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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '092bbd082121832d46cc14e02957c86535830796e3fc4152f2d8f59cc80e5a44' 
  AND token = 'yu7tm0I2WTOSu3U8x5cEQqtQmW9/w44GqqAFe7r38fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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