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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cceabb6f271ddb70066d692c2ceb2c30c9d6dc7e6eb3856bebd1e108a6087348' 
  AND token = '1Lcoz/eNLbzkkMtjt+M4i5k1lGBmSwq4iVkewYV6WmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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