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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '76a65df471b380cc7482a9a5d611b2695bc49b35573bdb1efb9c82a707e1a329' 
  AND token = 'sgabIYzm5zADAAuVt+5JV8CiKctGuES40x6AEynsJ5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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