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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '73a6f72c09db3795c66646db737e3033b084d935e2204347c507cdcac2610ff9' 
  AND token = '+PTG+F/XMj1WTj3ck9LzLFjjwTctwH7822C/NzS/Xuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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