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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '39a0e3a17da4f5c36970b9960dd41318d0945838e5bc2299e92d8a7d58e594f2' 
  AND token = 'W5VbdvVVfwKrb5ryrN7blCz0tOKu7HDLPvv5oJ3x/a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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