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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '36200deadcc4442b58c4a61fe5844ab725054a911c74de4a46704e7d8db3e032' 
  AND token = '1giC2G2btYAhSU7zYSfMVa4mNwNu8AmRhzHjOmZAkBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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