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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c38ba2b412a03449b5e3cf1b3032ffe2c30b9ae1d15f6dca13e84dbf4414e1d1' 
  AND token = 'X5FC7qjGo4cDTgSA4C/lLlUtNLPobp7iTAWUoZnJAYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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