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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7779422f688921567daede2c3da1363080e09a31bc287156be62fa2ea24d5174' 
  AND token = 'Yizl1cQa4Bxgv4ghXv3Wgsv3aCqSJnUPOeayLA7pGCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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