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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '65d4dd4d2ae382344588e25b17e1310d3ee8f2468ea0ad67c3eddf2542c35b6b' 
  AND token = 'CRr8KaHGGNTDX5SXK853fRXHgIMOKcLqZENRaV8sSos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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