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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8446cbce4c865d8e0a98da62bf7551d03e97c52b4814bc6a31a76b741a873c43' 
  AND token = 'nGP9m5e/ovPKk98z/o24vGy+HGJwE2GCsmUepPcUjpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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