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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '428a6bd4ca7a00c1ae5327484ce18abe6d9623f425c27f686dfa4d9d776014d0' 
  AND token = 'k0ZTnJJfOLLS45hU7dUzZPtnG0oUmh4Y3oPdxnE39QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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