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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1335476e5368483b6c2d47d10fb09a194582e6e7bb3be67c8e88a0a0496e9b0e' 
  AND token = 'E/glB/h8kEZnMbJo4OwnldADqySmtODnSejqJ2/+k0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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