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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '50069a082f7cd94f69f678cc1cae01461284dab14884ea696ae22d828def6db3' 
  AND token = '3EI8mAq69MjnV7NdDbwrifbe1My1VL1lvRhInUjE2CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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