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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e362bf2eacad0fc451bbb77c70f3a6f3a97f1ae0c9fd4977dbfde3485308e40c' 
  AND token = 'PhK6r1nBO4xWU4WZ3lEWvuzks6/UnjQX3Mln2LwrthQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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