SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '04807c8c3302df64f1fa5277d06f9805aaa82912fb31de3c407ac797c023610a' 
  AND token = 'gYFyjLPK/xd+ZoXzGjoGZD7r1Vk17Jdbwdm7LCMV0B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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