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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f89d5f016f99f40502f4a9964eedf2a41164c7c571720949526d1cc111d2c2b7' 
  AND token = '8vmdSU0ADEs36J73fRVBt9L+QBNtXiKq6iUrdEujV7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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