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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '286779b443547886b75a7b6a8253427d13aeca0d20bbd484c93372ffe30f9a5a' 
  AND token = '+Exfyn6pieBEnsA0nULGiOcnsJ0DI1WGwtXUVu0LIHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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