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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7346e9f77247b934d52e9beebae5316005a0cf469ee95708e104f19b4aadc916' 
  AND token = 'SC97n5eZrN7/gPGAj0sOxnIOOovoIg/oI2moi0GYmVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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