SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '67eece8032c78d0252d7dfac6ea759cf7274f512a91f253c697507b0b357db32' 
  AND token = 'bcsBjkx8YJdqKjC1EOMgn1G/xxmaCAzgrv+sNuKcqmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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