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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '89324940c48e3591af8c93669407c5de65639f6ce2a7611738df2e3f65a99aad' 
  AND token = 'lZaB/yxfx3RRPfQLmWGQw5GlwXA69/ZxdrBHmwe/qSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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