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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '399466d7ebaa35e3b35814f5710d5e36f00543497cfc2962dc1b5be85e91e234' 
  AND token = 'IfBs64g/6pY+Iygda6FxWd22H4wVO91ODYedx+oxJt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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