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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3704d5fb8f055a1004535a906a82d3c516f13f9bd4755b14d0bb9ec8319ac0ff' 
  AND token = '44AjqMNaSd/+xz62VDe0eO3Gj784dZ9rrzPA3nTvna4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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