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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3be7284f4e5b0d1ecf8170d76a6ebf6e7731b3c8bcc212a180037c797e36ebbb' 
  AND token = 'xkwiy4Pr2BpN6C4qgmkVbAsank6GYmyIaU4FpYzMY7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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