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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0ef6adb69c3bcf8ac62069780eba60b0b066a7eb8b456a3ef3e9a74b74c34103' 
  AND token = 'iXKrL+VFRArTQtp+BzI4e15hPxkhnbSGx6Nt1tb9W+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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