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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7af1c5d7de0150a4fb53bb35de99a9e1d69ed37c99cc56b886d0e4a343bf8fd0' 
  AND token = 'TAabDyW//etWXjwhrPT0OLimMyVtbjQEzqYgHHWPFDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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