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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '84d54365ffc696751157c68103fe1eebb2714e039596d6e1d02ebaa16e8df049' 
  AND token = 'ChzmnCkjbajt+akId2IQJA/3a8EMM9LKteoOIp3k+HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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