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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '40807f93a92d085ac7075dade859de43c3ddf36c09624444f5644c4fad077332' 
  AND token = 'cRp/3/shyIMGYzpYy3y9wu+oYj6Ujab582j/MtdXZ/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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