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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6bc5a7fde7d986d5c03627c06e5ec9e0b634acb9c970104697cf4cd5450a6ea5' 
  AND token = 'aeMho3xlDehOZJdLjieE5drpbJt9Bz91++iIJw82ITA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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