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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5db140e89ec31ccc4841457231bb7e74d60d09e0a09e5a111e6ae32fc98c30d2' 
  AND token = 'f1dnuK4AkVrcvXPc+C0sKCaxd2YLc32rrpFndeNgW7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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