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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c85089da37516db481d62451526e482d90ddcfecd266bc398da8ca8cd461b84d' 
  AND token = 'pMG4JuhA44TXpnsrXG14Mb8F4F3GUDJylrGni9rbx6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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