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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2bad8307d74ad36f65e623d40f598b7c4659cab3a5f3506a00dfe7639243df50' 
  AND token = '4jQUSvGtUjWV1LS5HyV1qup+bRmQ5oKb68CmiqaLvuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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