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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4797076862ff04f827d481ce8ca407df976bed39f071131c5435bd53160cfcc3' 
  AND token = 'x7aEhuMbCnD/Pp6X7CrPl6z7bBR6+yCFIl4Fk8TCWXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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